Hot-air furnace



May 18,1926

L. W. HAMILTON HOT AIR FURNACE Filed August 6, 1923 Patented May 18, 1926.

UNITED stares LOUIS WM, HAMILTON, 01F KENOSI-IA, WISCONSIN.

HOT-AIR FURNACE.

Application filed August. 6, 1923.

My invention relates to improvements in hot air furnaces, and it consists in the combinations, constructions, and arrangements herein described and claimed.

An object of my invention is to provide a hot air furnace of the character described by means of which a uniform distribution of the airto be heated is brought about and maintained through the heatingflues and subsequently to the delivery head.

A further object of my invention is to provide a hot air furnace of the character described which is particularly well adapted for use with crude oil burners and the like.

A further object of my invention is to provide a hot air furnace of the character described in which a novel means is employed for bringing about the practically complete absorption of the heat by the fines. thereby precluding heavy B. t. u. losses through the chimney or stack.

A further object of my invention is to providev a, hot air furnace of the character described that is extremely clean due to the fact that none of the products of combustion are permitted to have access to the chamber about the fire pot and flue case,

A further object of my invention is to provide a hot air furnace of the character described that is compact in form, simple in construction, and which is thoroughly practical for the purpose intended.

Other objects and advantages will appear in the'following specification, and the novel features of the invention will be particulan ly pointed out in the appended claim.

My invention is illustrated in the accompanying drawings, forming part of this application, in which- N Figure lis a side elevation of an embodiment of my invention, a part thereof broken away, and

Figure 2 is an opposite side elevation of the mechanism illustrated in Figure 1, partially broken away.

In carrying out my invention, I make st.- of a combustion chamber 1 having a brick arch 2 at the lower end thereof beneath which an oil burner is disposed the general position of which is indicated at 3.

A door 4 is hingedly mounted to one side of the combustion chamber 1, and when open by any suitable means, such as a chain or the like in common use at the present time, provides access to the lower portion of Serial No. 655,965.

the combustion chamber 1 beneath the arch 2.

A plurality of equally spaced apart flue tubes 5 are projected through the combustion chamber 1 above the arch 2. The tubes 5 are in parallel relation with one another and. are open at their opposite ends so that air exteriorly of the combustion chamber 1 may pass therethrough and be heated.

A return sheet 6, extending the entire width of the combustion chamber 1 is dis posed inand adjacent the rear portion of the combustion chamber so that its lower.

end 7 (see dotted lines in Figure 2) is Well beneath the arch 2. The sheet 6 is then convoluted in such a manner as to extend between the parallel flue tubes 5 to a point directly above the center of that portion of the combustion chamber 1 occupied by the flue tubes 5. The purpose of this return sheet is to guide the products of combustion and flames from the burner 3 up over the sheet 6 and down again prior to withdrawal of the products of combustion through a stack 8.

The combustion chamber 1 is completely enclosed on two sides, the rear and the top by means of a casing 9 at a predetermined distance from the wall of the combustion chamber which forms an air space or circulating jacket 10. The stack 8 is projected through this space 10 and the casing 9 so that it may be connected by any suitable means through a chimney or brick stack employed.

The casing 9 is provided with a. pair of relatively large openings 11 through each of its side walls at the lower end thereof so that fresh air may enter through the openings 11 and pass through the flue tubes 5 and be heated.

Means for guiding the fresh air entered through the openings 11 on one side of the casing 9 through only half of the fines 5 is provided in a partition wall 12 extending from the lower corner, as viewed in Figure 2, of the chamber 10 to the upper and substantially opposite corner. The partition wall or baflie wall 12 is convoluted as at 13 so that it may pass between adjacent flue tubes 5. Thus all of the air entered through the openings 11 on one side of the device must pass through the flue tubes 5, shown in dotted lines in Figure 1, and to the right of the baffle wall 12, whereupon it may have access to the main portion of the charnber 10 and delivered through the delivery pipes 1 to suitable registers or the like.

The battle w: ll 12 on the opposite side of the heating chamber 10 (see Figure 2) extends with its upper and lower extremities in the opposite directions so that all of the fresh air entering through the openings 11 in that wall, pass through the remaining flue tubes 5, and thereupon to the chamber 10.

A door 15 is provided for the combustion chamber 1 to regulate the heat therein. A door 16 is also provided in the combustion chamber 1 beneath the arch 2 which may be employed in gaining access to the burner 13 if desired.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. As the air enters the openings 11 on the opposite side walls of the casing 9, the air on one side of the combustion chamber 1 must pass through only those flue tubes on the right of the battle sheet 13, whereupon it may unite with the air passing through the remaining tubes 5 and from the opposite holes 11 and be delivered through the delivery tubes lei properly warmed for use.

it will be noted that I employ means by which practically all of the heat from the burner is absorbed by the fresh air passing through the lines 5. This means consists chiefly in the provision of the return sheet 6 and the positioning of the stack 8 which neces itates the travel of the heat waves, i'iames, and products of combustion into contact with the tubes 5 at the forward portion of the furnace and thence over the top of the return sheet 6 and down again, passing into contact with th remaining tubes 5 Jrior to its passage and withdrawal through the stack 8. Obviously very little heat i.-; left due to the products of combustion passing up through the stack.

I claim:

A hot air furnace comprising a combustion chamber, a plurality of tubes exteniiling from side to side of said chamber and haw ing their open ends flush with the outer surfaces of the combustion chamber walls, a casing housing said combustion. chamber and being spaced from the walls of said chamber carrying the tubes, partitions disposed between said tube carrying chamber walls anti said casing walls disposed parallel therewith, said last named casing \Ytllis' having air inlet openings, said partitions causing the air flowing through the inlet openings on one side of the casi g to pass through substantially one-half of the tubes. and the air flowing through the inlet openings on the other side of the casing to pass through the rest of the tubes, and means for receiving the two currents of air and for conveying the air from the furnace.

LOUIS M. IL MILTON. 

